Horace Gray, Hefner v. Northwestern Mutual Life Insurance Company…
“ A fortiori, it does not render a decree void, so that it can be treated as a nullity in a collateral action.As a general rule, a court of equity, in a suit to foreclose a mortgage, will not undertake to determine the validity of a title prior to the mortgage, and adverse to both mortgagor and mortgagee; because such a controversy is independent of the controversy between the mortgagor and the mortgagee as to the foreclosure or redemption of the mortgage, and to join the two controversies in one bill would make it multifarious. ”
